Hi,
    I am writing a "Gridmap callout" module from an information
provided by this link

http://www.globus.org/security/callouts/

   I am just a beginner for C programming but I would like to know if
I have to make this module a thread-safe?

   I am planning to make this module read/update a particular file
when it receive a request, but I am not sure if I have to implement
any locking mechanism (which I still don't know how to do this) so
that multiple requests do not interfere with each other.


Thanks,

Thawan Koooubrat

Department of Computer Engineering
Faculty of Engineering
Chulalongkorn University

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